Wall box



May 13', 1924. 1,493,875

L. FREDERICK WALL Box Filed Feb.v 12 1923 I I I l I l I I I I I I I `I II I I I I I I I I I l @Ummm I ummm S S Patented May i3, 1924-.

UNITED STATES LAWRENCE IVI. FREDERICK, O` ATLANTA, GEGRGIA.

WALL BOX.

Application filed FebruarylB, 1922i. Serial No. 618,493.

To all whom it may concern.'

Be it known that l, LAWRENCE M. FRED- Enron, a citizen of the UnitedStates, residing` at Atlanta, in the county of Fulton and State ofGeorgia, have invented certain new and useful Improvements in llVa-llBoxes, of which the following is a specification. i

My invention relates to improvements in wall boxes and has for theprimary object thereof, the provision of such a device that may beincorporated into the building wall during the construction thereof forproviding` a fresh air inlet into-the building, the box being of such alnature andconstruction as to be readily adapted to walls of differentthicknesses. f

A further object of the invention resides in the provision of such aywall box, wherein the flow of air into the building through the box maybe regulated by a sliding damper plate, my invention ,being furthercharacterized by its simplicity of construction, and easy ofinstallation.

The nature and advantages of the invention will be better understoodwhen the following detailed description is read in connection with theaccompanying drawings, the invention residing in the construction,combination, and arrangement of parts as claimed.

In the drawing forming part of this application` like numerals ofreference indicate similar parts in the several views, and whereinFigure l is a front eleva-tional view of a wall box constructed inaccordance with my invention; and being shown. as incorporated withinthe building wall and a portion thereof being fragmentarily shown.

Figure 2 is a rear elevational view of the wall box, a portion of thesliding damper plate beingbroken awa-y for more clearly disclosing theinterior of the boX.

Figure 3 is a vertical. transverse cross sectional view upon the brokenline of Figure l.

Figure l is a fragmentary cross sectional view through a portion of thebox, and

Figure 5 is a perspective view of a specific form of catch employed in.conjunction with my invention..

Viith specific reference to the drawings, my device constitutes theprovision of a substantially elongated and rectangular frame 5, which isadapted to be set directly into the building wall A during theconstruction thereof. It is desirable that 'the `width of this frame beless than the thickness of the wall, the same being formed at its frontend and upon its four sides thereof,rv

with a iange 6, which flange is adapted for close contact with the outersurface of said wall A. Connected to the' inner `end of the frame5,`through the instrumentality of a desirable number of metallic strips7 is a substantially rectangular shaped frame 8, of l. shape in crosssection, and adapted to be embedded within theusual plaster surface B,upon the interior of the wallA. These metallic strip members T may beformed withfa plurality of openings `thefrein for receiving thefastening means f), whereby the frames 5 and S may be adjusted tocompensate for different thickness of wall construction.

"Within the front end of the frame 5, there is inserted what may betermed a louver frame l0, also of open rectangular consti-nothin andprovided with a renewable inner wall of screening ll. This louver frame10 is formed with a plurality of. longitudinally,extending spaced louveror bevel plates l2, the same being inclined upwardly towards their innerends as per Figure 3. rThe front end of the lonver frame l0 is flangedas at 13, whereby the. same may be rigidly secured within the tirstmentioned frame 5 through the instrumentalityv of any desirable designof lgrill plate ll. The louver frame l0 is further characterized by theformation of a longitudinally extending' skirt portion l5 at .its upperend for preventing the direct passage of air through the upper portionof the frame so that all of the air passing through said frame will bedirected upwardly therein so that dust and grit will be deposited on thelouver plate 12 and subsequently roll down the inclined faces ofsaid'plates and outwardly through the grid.

Secured to the inner wall frame 8 as at 16 is a substantially U shapesliding damper guide 17, "this guide being formed with a pair of spacedUshaped plates or strips, as more clearly shown iniFigures 3 and 4.Adapted for free vertical. sliding movement within the frame 17 is adamper plate 18, to the lower opposite ends of which are connectedchains or other flexible members 19. The upper ends of these chains aresecured to a chain section 20, this last mentioned lli chain sectionadapted for cooperation with a T shaped opening' 2l within a wallbracket 22 'for maintaining` the said damper plate in adjustedpositions. It is of course understood that the bracket 22 is rigidlySecured to the inner surface of the wall A and in a position above thesaid wall box.

In view of the above description, it is believed by me that theadvantages and o-peration of a wall box constructed in conformity withmy invention will be readily appreciated by those skilled in the artyand although I have herein shown and described the preferred embodimentot my invention, it is nevertheless to be understood 'that minor changesmay be made therein, without departing Jfrom the spirit and scope of theinvention as claimed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent is 1- l. In a wall box of the class-described,a front and rear frame member, adjustable connections between said-irame members7 a louver frame removably positioned Vwithin v said-frontfra-me and a grill plate removably positioned upon the outer side of`said front frame and adapted for maintaining said louver frame inposition therein.

2. In a wall box of the class described, a front and rear frame member,adjustable connections between said frame membersy a louver frameremovably positioned within said front frame, a grill plate removablypositioned upon the outer side of said front frame and adapted formaintaining said louver frame in position therein, and a sliding damperupon said inner frame.

3. In a wall box ot' the class described, a front and rear frame member,adjustable connections between said frame members, a louver frameremovably positioned within said front frame, a grill plate removablypositioned upon the outer side of said front frame and adapted forn'iaintaining said louver frame in. position the-rein, a sliding damperupon said inner frame, and means for maintaining said sliding damper inadjusted positions.

In testimony whereof I affix my signature.

LAWRENCE M. FREDERICK.

